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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d55198f54d33bf0f8fa935a4ed2e26dd21948c05d14cd2f3f97047623bbe3b7' 
  AND token = 'pqMeHQuek/yiU6lPTCIxcft+Sk+Svkbv88wePloAJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}